Are you set on a full range electrostatic? If not, consider used Innersound Eros. This is an 'stat panel mated to a transmission line bass section which is driven by an integrated amp/crossover unit. The panel itself is quite efficient and the speaker can be driven to astonishing levels (if so desired). The only caveat is that your amp must be stable into a difficult impedance load. I would expect that your Carys would be just fine.
One further comment on the possibility of the Quads. Given your listening preferences, there is no way in the world that these will satisfy. There were - and are - great speakers for certain things, but high SPLs? No way.
One further comment on the possibility of the Quads. Given your listening preferences, there is no way in the world that these will satisfy. There were - and are - great speakers for certain things, but high SPLs? No way.